Machine for grinding and polishing slabs



. -May' 19, 1925.-

1,538,463 J. {CARRIE I MACHINE. FOR GRINDING AND POLISHINGQSLABS F1ledYlVIarch. 10, 192.4 i 2 Sheets-Sheet. i

I I 0W Mayl9. 1925." 1,538,463-

J. CARRIE MACHINE. FOR GRINDING AND POLISHING SLABS File MarQh ,;1924 .2' Sheets-Shet 2 I Z7' gd/iiw ahva Patented May 19, '1925.

UNITED STATES 1,538,463 PATENT" OFFICE. I

JAMES CARRIE, OF BUTLER, PENNSYLVANIA, ASSIGNOR TO PLATE GLASS MACHINERY so, or BUTLER,

PENNSYLVANIA.

MACHINE EOE GRINDING AND POLISHING SLABS.

' Application filed March 10, 1924. Serial No. 693,066.

To all whom it may cmwem:

Be it known that I, JAMES CARRIE, a citizen of Great Britain, and resident of, Butler, in the county of Butler and State of Pennsylvania, have invented certain new and useful Im rovements in Machines for Grinding and Polishing Slabs; and I do hereby declare-that the following is a full, clear, and exact description thereof.

My invention refers to new and useful time, complete such grinding and polishing" in the minimum space of time. In actual reduction to practice, with reference to my previous polishing and grinding machines, It developed in polishing that the central area,

of the plates'of lass were quickly polished, but the outer e ges of the plates-required more time to reduce them to the same degree of polish as the intermediate-field.

In the patents referred to above, the polishing and grinding apparatus, in practice, 7 has been installed in fixed position and plate carriers or cars'havebeen caused to-travel under the burnishin and polishin shoes, which shoes were su jected to a pl anetary movement. It was noted, as previously stated, that the longitudinal center of the glass, (figured in the direction of travel of the carriage,) was more quickly polished than the outer edges, due to the fact that the polishing units travel across the imaginary central line of the glass moreoften in the course of operation, than they travel over the edges. This is caused, 1n other words, by the development of a planetary movement of the polishing shoes in conjunction with the longitudinal travel of the carriage carrying the plates of lass. The above noted unevenness in polising of the longitudinal center or field of the glass plate to its outer edges, has been overcome by an advance in the art, to which my present invention refers, which advance embodied the a plication of an additional series of grin mg and polishing shoes,

dis-

posed between a group of planetary driven shoes. The auxiliary shoes, so disposed, being mounted upon idle spindles, whereby the motion imparted thereto, is due 0111 to the rotation of the main head. Wit the above and other objects in view, the invention consists in certain peculiarities of construction and combination of partsas will be hereinafter set forth in reference to the accompanying drawings, and subsequently claimed. 7

In the drawings, Figure 1 represents a diagrammatic view in elevation of a grinding and polishing machine, embodying the features of my present invention, parts being broken away in sections to more clearl illustrate details of construction.

Figure 2 represents a plan sectional view, the section being indicated by line 22 of Figure 1.

Figure 3 represents a fied form of shoe.

Referring by characters to the drawings, 1 represents a suitable frame, which carries bearings and supports for-a main shaft. 2, there being means for vertically adjusting the shaft, and a gear wheel 3 for rotating the same, all of which mechanism constitutes no part of my present invention.

The main drive shaft 2 has secured thereplan view of modito a master head 4 and rigidly secured to the sleeve of the non-rotary support. ing frame 1 is a master gear wheel 5. This gear wheel 5 is meshed with a seriesof intermediate gear wheels 6, which latter gear wheels impart drive to pinions 7, that are fastened on vertically disposed auxiliary drive shafts 8, the same being. journalled in the master head 4. 1

Each auxiliary drive shaft 8 has secured to its lower end an auxiliary skeleton head 9 provided with a series of vertically d1sposed bearings for groups of spindles 10, as best shown in Figure 2.

These spindles 10 are adapted to revolve idly and their lower end has secured there- 'to, grinding andpolishingshoes 11.

groups of auxiliary shoes are not positively riven as is the case in the shoes disclosed in my Patent No. 1,430,214.

The master head, which carries the gears practically ground to the desired degree in for imparting planetary movement to the groups of polishing and grinding shoes 11, is provided with suitable gear case or housin 12. i

becured to the master head 4:, by brackets 13, are a series of journalled boxes 14, which journalled boxes form bars for auxiliary spindles 15. These auxiliary spindles carry auxiliary grinding and polishing shoes 16.

The auxiliary or edge grinding and polish.- ing shoes 16, as best shown in Figure 2 of the drawings, are disposed approximately upon the same major peripheral or circular plane, as the groups of grinding and polishing shoes 11 and they are radially positioned between each group of shoes.

As shown'in Figure 1, the glass plate 17, is suitably mounted upon and secured to a longitudinal traveling table .18, which table is'supported by truck wheels, adapted to traveling upon tracks 19. Thus, as indicated by an arrow in Figure 2, the table carrying the glass plate, will travel longitudinally with reference to the fixed center of motion of-the groups of grinding and polishing shoes.

From the foregoing description, it will be seen that when the master head 4 is put into motion, the groups of grinding and polishing shoes 11, will through their gear connection, cause said groups to develop a planetary motion. auxiliary edge polishing and grinding shoes 16 will simply develop a rotary motion with respect to the axes of the machine, and the auxiliary shoes will, of course, rotate independently,'which rotation is imparted thereto, due to the traveling of the mechanism only. a

The rotation of the shoes 11 is also developed in the same manner and is, of course, independent of any positivedrive. Thus it will be seen that allthe shoes rotate upon their axes independently of any positive drive mechanism, whereby the plate of glass is more evenly and more effectually polished to the desired degree, and owing to this construction, by actual test, it has been found that the glass, when polished tothe desired degree, is practically of uniform thickness. In other words, the tendency of the glass to grinding or polishing, more readily at the longitudinal center of the carriage, is overcome, whereby the edges of the glass, as indicated at X, Figure 2, are

At the same time, the' 'By arranging the shoes eccentric to their centers a somewhat planetary movement of the shoe will develop to maintain the rouge face of the plate of glass in uniform shape or layer, thus tending to spreading the rouge, which is distributed upon the surface of the glass and hasa tendency to become hard on its face. In other words, if the shoes are supported in the form of eccentrics, they will have a tendency to maintain a uniform spread of the rouge and prevent it from accumulating or caking at any spot upon the surface of the glass.

. 1. A grinding and polishing machine having a main shaft, a master head revoluble therein, a fixed master gear positioned above the head, a plurality of vertically disposed spindles journalled on the master head and in gear connection with the master gear wheel, auxiliary heads carried by the spindles, groups of grinding and polishing shoes carried by each of said auxiliary heads and a series of auxiliary grinding and polishing shoes carried by the master head, the same being circumferentially positioned at a point approximating the maximum circle traveled in by the shoes of the groups of grinding and polishing shoes.

2. A grinding.,{-'and polishing machine comprisingjalongitudinal traveling carriage adapted to receive aplate of glass, a rotary grinding mechanism .fixedlypositioned above the table arid a series of groups of grinding and polishing shoes, means for impartinga planetary motion to'the same and auxiliary grinding and polishing shoes interposed between the outer shoes of each group,-tlie same being provided with means for imparting a rotary motion thereto.

In testimony that I claim the foregoing I have hereunto set my hand at Butler, in the county of Butler and State of Pennsylvania.

4 JAMES CARRIE. 

